EP 3765406 B1 20220302 - PURIFICATION OF BORIC ACID WITH ION EXCHANGE PROCESS
Title (en)
PURIFICATION OF BORIC ACID WITH ION EXCHANGE PROCESS
Title (de)
REINIGUNG VON BORSÄURE MIT IONENAUSTAUSCHVERFAHREN
Title (fr)
PURIFICATION D'ACIDE BORIQUE AVEC UN PROCÉDÉ D'ÉCHANGE D'IONS
Publication
Application
Priority
- TR 201803636 A 20180314
- IB 2019052075 W 20190314
Abstract (en)
[origin: WO2019175825A1] The present invention relates to the process of purification of boric acid by ion exchange method. Boric acid is dissolved in hot demineralized water. The hot solution is pressure-filtered. The hot saturated solution, which is purified from water-insoluble, is passed through a column containing strong cation exchange resin, followed by a column containing weak anion exchange resin at the same temperature and cooled afterwards. The crystals settling by cooling are separated from the mother liquor, the amount of aqueous solution within them is reduced and then dried. The waste solution formed during crystallization and filtrate formed after separation of crystals from aqueous solution are mixed and used in boric acid dissolving process. The developed method enables the reduction of sodium, sulfate, chloride and iron impurities of technical grade boric acid to less than 1 ppm and is more economic and environmental friendly than current methods.
IPC 8 full level
C01B 35/10 (2006.01); B01D 9/00 (2006.01)
CPC (source: EP RU US)
B01D 9/00 (2013.01 - RU); B01D 9/0004 (2013.01 - EP US); B01D 9/0059 (2013.01 - EP US); B01D 15/362 (2013.01 - US); B01D 15/363 (2013.01 - US); B01D 21/262 (2013.01 - US); B01D 21/267 (2013.01 - US); C01B 35/10 (2013.01 - RU); C01B 35/109 (2013.01 - EP US); B01D 9/0022 (2013.01 - EP); B01D 2009/0086 (2013.01 - US); C01P 2006/80 (2013.01 - US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2019175825 A1 20190919; EP 3765406 A1 20210120; EP 3765406 B1 20220302; EP 3765406 B8 20220608; RU 2759088 C1 20211109; US 11760648 B2 20230919; US 2020407233 A1 20201231
DOCDB simple family (application)
IB 2019052075 W 20190314; EP 19726136 A 20190314; RU 2020129220 A 20190314; US 201916979196 A 20190314